ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Simple formula for the ionization rate of diatomic molecules in an intense laser field using the velocity gauge |
Tang Zeng-Hua (唐增华), Li Yong-Qing (李永庆), Ma Feng-Cai (马凤才) |
Department of Physics, Liaoning University, Shenyang 110036, China |
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Abstract We derive a general ionization rate formula for the system of diatomic molecules in the velocity gauge. A more concise expression of the photoionization rate in the tunnel region is obtained for the first time. Comparisons are made among the different versions of strong-field approximation. The numerical study shows that the ionization rate in the velocity gauge is underestimated by a few orders compared with that in the length gauge. Our simple formula of ionization rate may provide an insight into the ionization mechanism for the system of diatomic molecules.
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Received: 12 November 2012
Revised: 21 December 2012
Accepted manuscript online:
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PACS:
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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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33.80.Eh
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(Autoionization, photoionization, and photodetachment)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11274149) and the Natural Science Foundation of Liaoning Province, China (Grant No. 20121032). |
Corresponding Authors:
Li Yong-Qing, Ma Feng-Cai
E-mail: yqli@lnu.edu.cn; fcma@lnu.edu.cn
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Cite this article:
Tang Zeng-Hua (唐增华), Li Yong-Qing (李永庆), Ma Feng-Cai (马凤才) Simple formula for the ionization rate of diatomic molecules in an intense laser field using the velocity gauge 2013 Chin. Phys. B 22 084203
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